Problem with Unity 5 Standard Assets

Hello! I am here because I have encountered a problem with the Unity 5 Standard Assets. When I import the assets I get this error:

Assets/Standard Assets/Characters/FirstPersonCharacter/Scripts/FirstPersonController.cs(4,27): error CS0234: The type or namespace name Utility' does not exist in the namespace UnityStandardAssets'. Are you missing an assembly reference?

Not sure why it doesn't work, this is an official Unity Asset Package. I would greatly appreciate if anyone could help me fix this. Thanks in advance.